With the release of Pandemic a couple weeks ago, virus based multiplayer games on the iOS are becoming a thing. Have a look at this trailer for the upcoming Pathogen.
I am not ashamed to admit that after watching this a couple times, I am a little confused about how the game works, but none the less, am excited to give it a go upon release (especially with friends). Planning to overtake huge swaths of the board in a single chain reaction looks to be a blast. No price has been set but the game will be out on the App Store next week on November 7th.